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CaliforniaWgional Water Quality Co 1 Board / <br /> Central Valley Region i <br /> Karl E.Longley,ScD,P.E.,Chair r <br /> Linda S.Adams r�I i 4200,Rancho Cordova,California 9567&6114 Arnold <br /> SecEnvietaryforronmental <br /> n = e jhe 6)464-3291 •FAX(916)464-4645 Schwarzenegger <br /> Environments! lur.\u UV 111��� http://www.waterboards.ca.gov/centralvalley Governor <br /> Protection <br /> 8 July 2009 30L 1 00041 2009 <br /> Ms. Stephanie Furgal EtvVIR� II N <br /> SM CES <br /> �rERm1T1 Mr. Jay Allen <br /> Chevron Environmental Management Company Stone Brothers Management Company <br /> 6001 Bollinger Canyon Road 1024 W. Robinhood Dr. <br /> San Ramon, CA 94583 Stockton, CA 95207 <br /> GROUNDWATER MONITORING FREQUENCY CHANGE TO SEMI-ANNUAL, MONTGOMERY <br /> WARDS AND UNOCAL STATION 95098, 5400-5606 PACIFIC AVENUE, STOCKTON, SAN <br /> JOAQUIN COUNTY, CENTRAL VALLEY WATER BOARD CASE NOS. 390258 AND 390014 <br /> The California State Water Resources Control Board (State Water Board) Resolution No. 2009-0042 <br /> requires reduction from quarterly groundwater monitoring to semi-annual or less frequent monitoring at <br /> all sites, unless site-specific needs warrant otherwise, and requires notification to all responsible <br /> parties and the State Water Board of the new requirements by 1 August 2009. These two commingled <br /> plume sites are currently monitored under one Cleanup and Abatement Order No. R5-00-707, issued <br /> 8 September 2000, and several site wells are currently monitored on a quarterly basis. Central Valley <br /> Water Board staff is preparing a new Cleanup and Abatement Order (CAO), with a monitoring <br /> frequency of no more frequent than semi-annually. <br /> I have reviewed your case file and semi-annual monitoring appears appropriate for your site. Until <br /> issuance of the new CAO, you may, effective immediately, reduce all site wells to semi-annual <br /> monitoring during the first and third quarters. Central Valley Water Board staff will not recommend <br /> formal enforcement for violation of your existing CAO. Therefore, you are to implement semi-annual <br /> groundwater monitoring with groundwater samples being collected and analyzed for your site's <br /> constituents of concern every 1st and 3rd quarter of each calendar year until directed by this office to do <br /> otherwise. Monitoring reports detailing the results are to be submitted by the 301h day of the month <br /> following the end of the reporting quarter (30 April for the 1 at quarter event and 30 October for the <br /> 3rd quarter event). <br /> You are to also submit quarterly status reports by letter or email during the 2"d and 4th quarter of each <br /> calendar year (15 July for the 2"d quarter and 15 January for the 4th quarter) of all work conducted <br /> during that quarter until directed by this office to do otherwise. The status reports and semi-annual <br /> monitoring reports shall also include updates for scheduled work and requests for modifications to <br /> existing schedules posted in the State GeoTracker database, if applicable. <br /> You may contact me regarding questions by phone at (916) 464-4615; or for questions and status <br /> re rt subm�al�b� -mgil at 'barton waterboards.ca. ov. <br /> mes L.L. Barton, P.G_'./�W,Lro� <br /> Engineering Geologist <br /> cc: Ms. Judy Reid, SWRCB, UST Cleanup Fund (Commingled Plume Program), Sacramento <br /> Mr. Mike Infurna, San Joaquin County Environmental Health Division, Stockton <br /> Ms. Jennifer Johnston, AECOM Environmental, 10461 Old Placerville Rd, Ste 170, Sacramento <br /> 95827 <br /> California Environmental Protection Agency <br /> pia Recycled Paper <br />